Over three months, senior Biden administration officials held half a dozen urgent meetings with top Chinese officials in which the Americans presented intelligence showing Russia’s [troop buildup] around Ukraine and beseeched the Chinese to tell Russia not to invade, according to U.S. officials. Each time, the Chinese officials, including the foreign minister and the ambassador to the United States, rebuffed the Americans, saying they did not think an invasion was in the works. After one diplomatic exchange in December, U.S. officials got intelligence showing Beijing had shared the information with Moscow, telling the Russians that the United States was trying...